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Multiwavelength Analysis of A1240, the Double Radio-relic Merging Galaxy Cluster Embedded in an âĽ80 Mpc-long Cosmic Filament.
- Source :
-
Astrophysical Journal . 1/20/2022, Vol. 925 Issue 1, p1-17. 17p. - Publication Year :
- 2022
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Abstract
- We present a multiwavelength study of the double radio-relic cluster A1240 at z = 0.195. Our Subaru-based weak-lensing analysis detects three mass clumps forming an âĽ4 Mpc filamentary structure elongated in a northâ€"south orientation. The northern ( M 200 = 2.61 â' 0.60 + 0.51 Ă— 10 14 M ⊙ ) and middle ( M 200 = 1.09 â' 0.43 + 0.34 Ă— 10 14 M ⊙ ) mass clumps separated by âĽ1.3 Mpc are associated with A1240 and colocated with the X-ray peaks and cluster galaxy overdensities revealed by Chandra and MMT/Hectospec observations, respectively. The southern mass clump ( M 200 = 1.78 â' 0.55 + 0.44 Ă— 10 14 M ⊙ ), âĽ1.5 Mpc to the south of the middle clump, coincides with the galaxy overdensity in A1237, the A1240 companion cluster at z = 0.194. Considering the positions, orientations, and polarization fractions of the double radio relics measured by the LOFAR study, we suggest that A1240 is a postmerger binary system in the returning phase with a time since collision of âĽ1.7 Gyr. With the SDSS DR16 data analysis, we also find that A1240 is embedded in the much larger scale (âĽ80 Mpc) filamentary structure whose orientation is in remarkable agreement with the hypothesized merger axis of A1240. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 925
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 154934698
- Full Text :
- https://doi.org/10.3847/1538-4357/ac36c8